JMeter - How to solve “java.net.BindException: Address already in use: connect” issue on Windows

我会带着你远行 2023-08-17 16:40 100阅读 0赞

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This problem is Windows based. There is a article at https://support.microsoft.com/kb/q196271, which says Windows XP only will make outbound TCP/IP connections using ports ***1024-5000***, and takes up to ***4 minutes to recycle*** them. Therefore, if you do a lot of connections in a short amount of time, you can easily eat that port range up if you are running load tests.

### Resolution ###

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**IMPORTANT** This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs.  
The default maximum number of ephemeral TCP ports is 5000 in the products that are included in the "Applies to" section. A new parameter has been added in these products. To increase the maximum number of ephemeral ports, follow these steps:

1.  Start Registry Editor.
2.  Locate the following subkey in the registry, and then click **Parameters**:  
     
    
    HKEY\_LOCAL\_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters
3.  On the **Edit** menu, click **New**, and then add the following registry entry:Value Name: MaxUserPort  
    Value Type: DWORD  
    Value data: 65534  
    Valid Range: 5000-65534 (decimal)  
    Default: 0x1388 (5000 decimal)  
    Description: This parameter controls the maximum port number that is used when a program requests any available user port from the system.
4.  Exit Registry Editor, and then restart the computer.

Note An additional TCPTimedWaitDelay registry parameter determines how long a closed port waits until the closed port can be reused.

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